If Medusa's head takes the place of the representation of the female genitals, or rather if it isolates their horrifying effects from the pleasuregiving ones, it may be recalled that displaying the genitals is familiar in other connections as an apotropaic act.

It’s absolutely ridiculous that the presence or absence of a certain set of genitals is assumed to grant you some kind of inherent ability to perform a certain task, or an inborn desire to act a certain way.